Open walk roof: no guard if height ≤? (B 550 in extract 2440-2441).
Choices
- (A) 760
- (B) 550
- (C) 1050
- (D) 915
Correct answer: (B)
550
Explanation
Key: B 550mm.
Correct answer: (B)
550
Key: B 550mm.
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